US 2016/0260517 A1Published application

Dielectric Fluid Compositions for Enhanced Thermal Management

AssigneeDow Global Technologies LLC

InventorsSuh Joon Han, Dirk B. Zinkweg, Zenon Lysenko

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Abstract

A dielectric fluid composition for electrical apparatus comprises a functionalized 12-hydroxy stearic acid having desirable properties including a pour point less than −30° C. and a fire point greater than 250° C. It may be prepared by a process wherein 12-hydroxy methyl stearate is transesterified by reaction with a C3-C20 alcohol to form an alkyl-12-hydroxy stearate, followed by esterification thereof with a linear or branched C4-C20 carboxylic acid. This acid may be a free acid chloride, a fatty acid, a carboxylic acid anhydride, or combination thereof. The resulting functionalized 12-hydroxy stearic acid exhibits improved thermoxidative capability, low temperature flowability, and increased fire point.

Claims5

Dependent claims

A dielectric fluid composition for electrical apparatus

prepared by a process comprising
(a) reacting 12-hydroxy methyl stearate and a linear or branched C3 to C20 alcohol under conditions suitable to form an alkyl-12-hydroxy stearate;
and
(b) reacting the alkyl-12-hydroxy stearate and a carboxylic acid selected from the group consisting of linear and branched C4-C20 free acid chlorides, fatty acids, carboxylic acid anhydrides, and combinations thereof;
under conditions suitable to form a functionalized 12-hydroxy stearic acid having at least one property selected from the group consisting of:
(a) a number average molecular weight from 400 Daltons to 10,000 Daltons;
(b) a dielectric breakdown greater than 20 kilovolts/1 mm gap;
(c) a dissipation factor less than 0.2 percent at 25° C.;
(d) a fire point greater than 250° C.;
(e) a kinematic viscosity less than 35 centistokes at 40° C.;
(f) a pour point lower than −30° C.;
(g) an acidity less than 0.03 mg KOH/g;
and
(h) a combination thereof.

11 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/156,795Filed 17 May 2016
Priority: 30 Sep 2011
Published: 8 Sep 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H01B 3/20
Mainly consisting of organic substances: liquids, e.g. oils
C07C 51/367
By reactions not involving formation of carboxyl groups: by introduction of functional groups containing oxygen only in singly bound form
C07C 51/377
By reactions not involving formation of carboxyl groups: by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups
C07C 59/01
Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O—metal, —CHO, keto, ether, [IMAGE…: saturated…

Family

Application61/541,584Us provisional application · filed 30 Sep 2011
Application14/344,937Division · filed 14 Mar 2014
Application15/156,795Division
US 2014/0346414 A1Published application
US 9,416,089 B2Related patent
US 9,793,027 B2Related patent
US 2016/0260517 A1This patent

From the US filing history. Foreign family members aren’t listed.

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